Yolen, J., & Graves, L. D. (2011). Sister Bear: A Norse tale. Marshall Cavendish Children's.
Lua i Stíl Chicago (17ú heag.)Yolen, Jane, agus Linda Dockey Graves. Sister Bear: A Norse Tale. Tarrytown, NY: Marshall Cavendish Children's, 2011.
Lua MLA (8ú heag.)Yolen, Jane, agus Linda Dockey Graves. Sister Bear: A Norse Tale. Marshall Cavendish Children's, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.